Part I: Basic Topics in Anesthesiology | Anesthesiology: Examination

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A patient with severe pulmonary fibrosis wishes to travel on an airplane. What amount of supplemental oxygen will be needed to maintain the arterial oxygen concentration at about 70 mm Hg? Assume the airplane cabin is pressurized at 580 mm Hg and that the patient's alveolar-arterial oxygen gradient is 150 mm Hg.

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Respiration

The patient's alveolar oxygen concentration is estimated from the alveolar gas equation:

Nervous System Renal, Hepatic, Endocrine, Hematologic, and Metabolic Systems

Assuming a value of 0.8 for the respiratory quotient, the patient's alveolar oxygen concentration would be approximately 222 mm Hg when breathing 50% oxygen. The patient's arterial oxygen concentration would therefore be approximately 72 mm Hg. (5:459)

Pharmacology General Anesthesia

A clinician wishes to perform a single-breath induction with sevoflurane and exceed the maximum sevoflurane concentration supplied by the vaporizer. She fills a 3-L reservoir bag with oxygen and adds 2 mL of sevoflurane liquid to the bag. What will the concentration of sevoflurane vapor be in the reservoir bag? Assume the operating room is at sea level and the room temperature is 20°C. The ideal gas constant is 0.082 L-atm-°K-1-mole-1, the

Regional Anesthesia Practice Test

specific gravity of sevoflurane is 1.52, and its molecular weight is 200 g/mol. 12.2% 13.5% 14.8% 16.1% 18.5% A volume of 2 mL of sevoflurane liquid has a mass of 3.04 g corresponding to 0.0152 moles. The volume of an ideal gas, V, is nRT/P = (0.0152) × (0.082) × (273 + 20) = 0.365 L. A volume of 0.365 L of sevoflurane vapor in the 3-L reservoir bag represents a concentration of 12.2%. (5:627) In the typical operating room, patients lose heat via all of the following mechanisms EXCEPT sublimation conduction convection radiation evaporation The four mechanisms of heat loss are conduction, convection, radiation, and evaporation. Sublimation is the phase transition between a solid and a gas. (5:259) An anesthesiologist plans a clinical study comparing a new antiemetic with ondansetron. 100 women undergoing elective laparoscopic tubal ligation will be randomized to receive either the new antiemetic or a standard 4-mg dose of ondansetron. The primary outcome variable is the number of women that vomit postoperatively in each group. In all likelihood, the best statistical test to compare the two treatments will be Student's t-test for unpaired data Student's t-test for paired data analysis of variance chi squared Wilcoxon rank-sum test Of the tests listed, only the chi squared text compares proportions (in this case, the proportion ... GET ACCESS TO THIS RESOURCE

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Part I: Basic Topics in Anesthesiology | Anesthesiology: Examination

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